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Prashanth Rao
3b626efa47
## Summary Fix `on_bad_vectors="fill"` so it replaces only invalid or missing vector values instead of replacing the entire vector row. Fixes #3026. ## Reasoning The old Python sanitizer detected whether a vector row was bad at row granularity. For `fill`, it then used that row-level flag to replace the whole vector with `[fill_value] * dim`. That meant an input like `[1.0, NaN, 3.0]` became `[0.0, 0.0, 0.0]`, even though the documented and more useful behavior is to preserve valid values and fill only the bad element. I checked whether this should be a Rust-side fix so TypeScript users would benefit too. Today, Rust core exposes `NaNVectorBehavior::{Error, Keep}` for rejecting or keeping NaN vectors, while the Python `on_bad_vectors` API (`error`, `drop`, `fill`, `null`) is implemented in the Python ingestion sanitizer before data reaches Rust. TypeScript does not expose the Python `on_bad_vectors="fill"` behavior today. Moving this exact behavior to Rust would be a broader cross-language API change, so this PR keeps the fix scoped to the currently affected Python API. ## What changed - Added a small helper that fills bad vector rows by preserving valid elements, replacing NaN elements with `fill_value`, truncating vectors longer than the expected dimension, and padding short vectors with `fill_value`. - Kept the existing fast path unchanged: the helper only runs after bad vectors are detected and `on_bad_vectors="fill"` is selected. - Updated sanitizer and table tests to assert element-wise NaN replacement and short-vector padding for both `create_table` and `add`. ## Validation - `uv run ruff format .` - `uv run ruff check .` - `cd python && uv run --no-sync pytest python/tests/test_util.py::test_handle_bad_vectors_jagged python/tests/test_util.py::test_handle_bad_vectors_nan python/tests/test_table.py::test_create_with_nans python/tests/test_table.py::test_add_with_nans -vv` Targeted pytest result: `10 passed`. ## Why this fix is Python-side (and not Rust) The problematic behavior lives in Python’s `on_bad_vectors` sanitizer, before data is handed off to Rust. Rust currently only exposes `NaNVectorBehavior::{Error, Keep}` for add operations, while Python has the richer `on_bad_vectors={"error","drop","fill","null"}` API. TypeScript does not currently expose the Python-style fill behavior, so moving this exact fix into Rust would require designing a broader cross-language bad-vector handling API. This PR keeps the change scoped to the existing affected surface: Python’s `on_bad_vectors="fill"` path. This way, Python users immediately benefit.
The Multimodal AI Lakehouse
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The ultimate multimodal data platform for AI/ML applications.
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| Interface | Documentation |
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| Typescript SDK | https://lancedb.github.io/lancedb/js/globals/ |
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